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WO1995029033A1 - Method for welding - Google Patents

Method for welding Download PDF

Info

Publication number
WO1995029033A1
WO1995029033A1 PCT/GB1995/000925 GB9500925W WO9529033A1 WO 1995029033 A1 WO1995029033 A1 WO 1995029033A1 GB 9500925 W GB9500925 W GB 9500925W WO 9529033 A1 WO9529033 A1 WO 9529033A1
Authority
WO
WIPO (PCT)
Prior art keywords
welding
plastic
laser
weld
metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB1995/000925
Other languages
French (fr)
Inventor
John Tyrer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Loughborough University
Original Assignee
Loughborough University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Loughborough University filed Critical Loughborough University
Priority to AU23128/95A priority Critical patent/AU2312895A/en
Priority to EP95916753A priority patent/EP0757605A1/en
Publication of WO1995029033A1 publication Critical patent/WO1995029033A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/60—Preliminary treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/32—Bonding taking account of the properties of the material involved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/34—Coated articles, e.g. plated or painted; Surface treated articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26

Definitions

  • This invention relates to welding, more particularly to welding plastic-coated metal.
  • Plastic-coated steel is nowadays available in which the plastic has strong adherence to the steel. This would be a good material from which to make canisters, such as food cans, in place of the conventional tin and chromium oxide coated steel on to which natural and/or synthetic lacquers are adhered. This conventional material is lap or butt welded using electrical resistance techniques, after first removing the lacquer layer. The plastic coating of the new steel is, however, much more difficult to remove. If it is incompletely removed, the weld may fail or the electrical welder can become contaminated by the plastic, and this will break the welding electrodes and halt the welding machine, with substantial uneconomic downtime and lost production.
  • the present invention provides a method for welding plastic-coated metal that is not prone to such failure.
  • the invention comprises a method for welding plastic-coated metal comprising approximating the pieces to be welded, removing the coating from the welding site using a laser to heat it and then laser-welding the metal-to-metal contact at the welding site in the absence of the coating.
  • the coating may be evaporated by the laser.
  • the pieces may be butt- or lap-welded.
  • a pulsed laser may be used, of which the mark/ space ratio and/or the pulse shape may be selected to produce a weld of optimum quality.
  • the method may be applied to the welding of metal, particularly steel, canisters.
  • the weld site after welding, may be coated with plastic. After the weld site has cooled some plastic may be removed from adjacent thereto and redeposited on the metal - this may be done by laser also.
  • Figure 1 is a series of cross-sections of a butt weld being formed; and Figure 2 is a series like Figure 1 of a lap weld being formed.
  • FIG. 1 illustrate a method for welding plastic 11 coated metal 12, e.g. steel, comprising approximating ( Figures 1A,2A) the pieces to be welded, removing ( Figures 1B,2B) the coating 11 from the welding site 13 using a laser 14 to heat it and then laser welding ( Figures 1C,2C) the metal-to-metal contact at the welding site 13 in the absence of the coating 11.
  • the coating 11 may be evaporated by the laser 14 - evaporated plastic may recondense on to cooler material adjacent the weld site, as may droplets of molten plastic.
  • a pulsed laser may be used. Control of the mark/ space ratio of the pulse and/or of pulse shape may allow optimum weld quality to be achieved for different types and thicknesses of plastic and substrate. It may be that removal of plastic is incomplete and that some plastic inclusions contaminate the weld - the degree to which this happens may be controlled by control over the pulsing in order to produce an acceptable weld quality.
  • Another method for controlling the process is to control the laser beam geometry so that different beam energy densities could be used for coating removal and for welding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)

Abstract

There is disclosed a method for welding plastic-coated metal comprising approximating the pieces to be welded, removing the coating from the welding site using a laser to heat it and then laser-welding the metal-to-metal contact at the welding site in the absence of the coating.

Description

METHODFORWELDING
This invention relates to welding, more particularly to welding plastic-coated metal.
Plastic-coated steel is nowadays available in which the plastic has strong adherence to the steel. This would be a good material from which to make canisters, such as food cans, in place of the conventional tin and chromium oxide coated steel on to which natural and/or synthetic lacquers are adhered. This conventional material is lap or butt welded using electrical resistance techniques, after first removing the lacquer layer. The plastic coating of the new steel is, however, much more difficult to remove. If it is incompletely removed, the weld may fail or the electrical welder can become contaminated by the plastic, and this will break the welding electrodes and halt the welding machine, with substantial uneconomic downtime and lost production.
The present invention provides a method for welding plastic-coated metal that is not prone to such failure.
The invention comprises a method for welding plastic-coated metal comprising approximating the pieces to be welded, removing the coating from the welding site using a laser to heat it and then laser-welding the metal-to-metal contact at the welding site in the absence of the coating.
The coating may be evaporated by the laser.
The pieces may be butt- or lap-welded.
A pulsed laser may be used, of which the mark/ space ratio and/or the pulse shape may be selected to produce a weld of optimum quality.
The method may be applied to the welding of metal, particularly steel, canisters.
The weld site, after welding, may be coated with plastic. After the weld site has cooled some plastic may be removed from adjacent thereto and redeposited on the metal - this may be done by laser also.
Embodiments of welding plastic-coated metal according to the invention will now be described with reference to the accompanying drawings, in which :-
Figure 1 is a series of cross-sections of a butt weld being formed; and Figure 2 is a series like Figure 1 of a lap weld being formed.
The drawings illustrate a method for welding plastic 11 coated metal 12, e.g. steel, comprising approximating (Figures 1A,2A) the pieces to be welded, removing (Figures 1B,2B) the coating 11 from the welding site 13 using a laser 14 to heat it and then laser welding (Figures 1C,2C) the metal-to-metal contact at the welding site 13 in the absence of the coating 11.
The coating 11 may be evaporated by the laser 14 - evaporated plastic may recondense on to cooler material adjacent the weld site, as may droplets of molten plastic.
A pulsed laser may be used. Control of the mark/ space ratio of the pulse and/or of pulse shape may allow optimum weld quality to be achieved for different types and thicknesses of plastic and substrate. It may be that removal of plastic is incomplete and that some plastic inclusions contaminate the weld - the degree to which this happens may be controlled by control over the pulsing in order to produce an acceptable weld quality.
Another method for controlling the process is to control the laser beam geometry so that different beam energy densities could be used for coating removal and for welding.
For certain applications, notably for food cans, it may be important to replace the plastic coating over the weld. Whilst this may be effected in different ways, and whilst it may be satisfactory to use a different coating (a prior-art lacquer, for example) it may well be possible in some circumstances to remove some plastic from adjacent the weld site and redeposit it on the exposed metal after the weld has been effected and the site cooled. A laser - perhaps the same laser - may be used to remove the plastic for this purpose.

Claims

CiAIMS
1. A method for welding plastic-coated metal comprising approximating the pieces to be welded, removing the coating from the welding site using a laser to heat it and then laser-welding the metal-to-metal contact at the welding site in the absence of the coating.
2. A method according to claim 1, in which the coating is evaporated by the laser.
3. A method according to claim 1 or claim 2, in which the pieces are butt-welded.
4. A method according to claim 1 or claim 2, in which the pieces are lap-welded.
5. A method according to any one of claims 1 to 4, in which a pulsed laser is used.
6. A method according to claim 5, in which the mark/space ratio of the pulse is selected to produce a weld of optimum quality.
7. A method according to claim 5 or claim 6, in which the pulse shape is selected to produce a weld of optimum quality.
8. A method according to any one of claims 1 to 7, applied in the welding of metal canisters.
9. A method according to any one of claims 1 to 8, in which the weld site, after welding, is coated with plastic.
10. A method according to claim 9, in which after the weld site has cooled some plastic is removed from adjacent thereto and redeposited on the metal.
11. A method according to claim 10, in which the plastic is removed from adjacent the weld site by a laser.
PCT/GB1995/000925 1994-04-26 1995-04-24 Method for welding Ceased WO1995029033A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU23128/95A AU2312895A (en) 1994-04-26 1995-04-24 Method for welding
EP95916753A EP0757605A1 (en) 1994-04-26 1995-04-24 Method for welding

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9408239.3 1994-04-26
GB9408239A GB9408239D0 (en) 1994-04-26 1994-04-26 Method for welding

Publications (1)

Publication Number Publication Date
WO1995029033A1 true WO1995029033A1 (en) 1995-11-02

Family

ID=10754130

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/000925 Ceased WO1995029033A1 (en) 1994-04-26 1995-04-24 Method for welding

Country Status (4)

Country Link
EP (1) EP0757605A1 (en)
AU (1) AU2312895A (en)
GB (1) GB9408239D0 (en)
WO (1) WO1995029033A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2798084A1 (en) * 1999-09-03 2001-03-09 Renault METHOD AND DEVICE FOR WELDING SHEETS
DE10315976A1 (en) * 2003-04-08 2004-10-21 Volkswagen Ag To prepare coated metal sheets for soldering/welding, for vehicle bodywork parts, the surface coating is removed by a laser beam at the joint surface zones
FR2891484A1 (en) * 2005-10-05 2007-04-06 Valeo Electronique Sys Liaison Welding of a sandwich sheet of two metal sheets containing a polymer layer to a metal surface of a component by directing a laser beam through perforations, notably for motor vehicle body and coachwork assemblies
EP1847330A2 (en) 2006-04-19 2007-10-24 Gebhardt-Stahl GmbH Method for producing a hollow body from a metal strip
DE102007028137A1 (en) * 2007-06-19 2008-12-24 Volkswagen Ag Method for beam welding for connecting two coated, especially galvanized sheet metal components, involves arranging different-welded sheet metal components initially relative to each other
WO2013050855A3 (en) * 2011-10-06 2013-07-11 Lincoln Global Inc. Apparatus for and method of laser cleaning of coated materials prior to welding
CN105689896A (en) * 2016-03-23 2016-06-22 昆山宝锦激光拼焊有限公司 Coating removing and welding integrated laser processing method for hot-rolled steel plates
DE102015226474A1 (en) * 2015-12-22 2017-06-22 Thyssenkrupp Ag Semi-finished products for the production of hollow profiles, hollow profiles thereof and methods for their production
WO2020102839A1 (en) * 2018-11-20 2020-05-28 Berndorf Innovations Und Technologie Gmbh Method for processing a strip
CN115734835A (en) * 2020-06-25 2023-03-03 罗伯特·博世有限公司 Method and apparatus for producing metal components coated with a plastic layer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0143450A2 (en) * 1983-11-28 1985-06-05 Elpatronic Ag Method and apparatus for pulsed high energy density welding
GB2202779A (en) * 1986-12-27 1988-10-05 Toyo Seikan Kaisha Ltd Butt welded cans
EP0508102A1 (en) * 1991-04-09 1992-10-14 Elpatronic Ag Method for seam welding metal plates

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0143450A2 (en) * 1983-11-28 1985-06-05 Elpatronic Ag Method and apparatus for pulsed high energy density welding
GB2202779A (en) * 1986-12-27 1988-10-05 Toyo Seikan Kaisha Ltd Butt welded cans
EP0508102A1 (en) * 1991-04-09 1992-10-14 Elpatronic Ag Method for seam welding metal plates

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2798084A1 (en) * 1999-09-03 2001-03-09 Renault METHOD AND DEVICE FOR WELDING SHEETS
WO2001017722A1 (en) * 1999-09-03 2001-03-15 Renault Method and device for welding sheet metal
DE10315976A1 (en) * 2003-04-08 2004-10-21 Volkswagen Ag To prepare coated metal sheets for soldering/welding, for vehicle bodywork parts, the surface coating is removed by a laser beam at the joint surface zones
FR2891484A1 (en) * 2005-10-05 2007-04-06 Valeo Electronique Sys Liaison Welding of a sandwich sheet of two metal sheets containing a polymer layer to a metal surface of a component by directing a laser beam through perforations, notably for motor vehicle body and coachwork assemblies
EP1772227A1 (en) * 2005-10-05 2007-04-11 Valeo Systèmes Thermiques Process for welding a sandwich sheet panel on metallic face of an organ
EP1847330A2 (en) 2006-04-19 2007-10-24 Gebhardt-Stahl GmbH Method for producing a hollow body from a metal strip
EP1847330A3 (en) * 2006-04-19 2007-11-21 Gebhardt-Stahl GmbH Method for producing a hollow body from a metal strip
DE102007028137A1 (en) * 2007-06-19 2008-12-24 Volkswagen Ag Method for beam welding for connecting two coated, especially galvanized sheet metal components, involves arranging different-welded sheet metal components initially relative to each other
WO2013050855A3 (en) * 2011-10-06 2013-07-11 Lincoln Global Inc. Apparatus for and method of laser cleaning of coated materials prior to welding
US8766140B2 (en) 2011-10-06 2014-07-01 Lincoln Global, Inc. Apparatus and method for laser cleaning of coated materials prior to welding
US9457432B2 (en) 2011-10-06 2016-10-04 Lincoln Global, Inc. Apparatus and method for laser cleaning of coated materials prior to welding
DE102015226474A1 (en) * 2015-12-22 2017-06-22 Thyssenkrupp Ag Semi-finished products for the production of hollow profiles, hollow profiles thereof and methods for their production
EP3393779A1 (en) * 2015-12-22 2018-10-31 ThyssenKrupp Steel Europe AG Semi-finished product for producing hollow profiled sections, hollow profiled sections made therefrom, and method for producing same
CN105689896A (en) * 2016-03-23 2016-06-22 昆山宝锦激光拼焊有限公司 Coating removing and welding integrated laser processing method for hot-rolled steel plates
WO2020102839A1 (en) * 2018-11-20 2020-05-28 Berndorf Innovations Und Technologie Gmbh Method for processing a strip
AT521996A1 (en) * 2018-11-20 2020-07-15 Berndorf Innovations Und Tech Gmbh Process for processing a tape
CN113056347A (en) * 2018-11-20 2021-06-29 贝恩多夫创新与技术有限公司 Method for processing tape
AT521996B1 (en) * 2018-11-20 2021-08-15 Berndorf Innovations Und Tech Gmbh Method of processing a tape
CN115734835A (en) * 2020-06-25 2023-03-03 罗伯特·博世有限公司 Method and apparatus for producing metal components coated with a plastic layer

Also Published As

Publication number Publication date
EP0757605A1 (en) 1997-02-12
GB9408239D0 (en) 1994-06-15
AU2312895A (en) 1995-11-16

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